Railway-tie plate.



L. DILWORTH.

RAILWAY TIE PLATE.

APPLICATION-FILED AUG. 6, 1908.

Patented July '20, 1909.

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WlTNESSES ow-umoamwl. Wumm'on. II c plate is plate is given its maximum'llNl Ell @fllES TENT enrich.

LAWRENCE DILWORTl-l, OF PITTSBU l-IG, Pill; NSYLVANL-r, ASSIGNOR TODILWORTH, PORTER & COMPANY, LIMITED, OF PHTSBURG, PENNSYLVANIA, ALIMITED PARTNERSHIP.

RAITELWAY-TIE PLATE;

no. eeaaae.

Specification of Letters Patent.

Patented July 20, 1909.

Application filed August 6, 1908. Serial No. 447,311.

an end VlBW showing a modified form of the plate.

My invention has relation to rai way tie plates of that form in whichthe plate is provided on its upper side, near one end, with a transverserail bearing shoulder or projection, the under side of the plate beingpro-- vided with a plurality of longitudinally extending adhesionflanges, and the top of the plate also having longitudinally extendinggrooves or depressions. These grooves or depressions are formed in theplate either for the purpose of materially reducing the weight and theamount of metal required, or are formed by the metal at those portionsof the plate being drawn down into the longitudinally extending adhesionflanges in the rolling operation. In either case, these grooves ordepressions are a feature of considerable importance, but they haveheretofore been a source of Weakness to the plate, since they have beenextended throughout the length. of the plate, interrupted only by thetrans verse raiLbearing shoulder or projection. The depth of the groovesor depressions has, therefore, been limited by the depth to which theycould be safely made adjacent to the rail-bearing shoulder orprojection, which is the point where the plate receives its greatestload.

In accordance with my invention, the tie provided on its upper surfacewith a plurality of longitudinal grooves or depressions, which aresimilar to those heretofore used, except that instead. of extending tothe base of the shoulder or projection, they terminate at the railseating side of such shoulder or projection at a distance from its base,thereby providing, adjacent to such base, a plain. surface portion ofthe plate of the full thickness of the plate. In this manner, thethickness at the point where it receives the greatest load and thegrooves or depressions can therefore be correspondingly increased indepth.

Referring to the accompanying drawing, the numeral 2 designates a tieplate having the transverse rail-bearing shoulder or projection 3 at itsupper side near one end, and

extending adhesion. flanges l, the intermediate flanges being usuallyo'l'less depth than the outer flanges.

5 designates the longitudinally extending grooves or depressions, which,as above stated, terminate short of the lease of the shoulder orprojection to provide the plainsurfaced portion 6 ol' the lull thicknessof the plate. These grooves or depressions 5 are preferably continued.at the opposite side of the shoulder or projection, and extend to theend of the plate, as shown.

7 designates the usual spike holes, by which the plate is secured. tothe tie.

In the form of my invention shown in Figs. 1, 2 and 3, the grooves ordepressions are intel-mediate of the adhesion flanges l. ln the formshown in Fig. 4, however, these grooves or depressions are immediatelyover the adhesion flanges, the metal therefrom being drawn or Workeddownwardly into the flanges, my invention being equally applicable toboth forms of grooved plates.

The advantages of my invention will be readily appreciated from theil'oregoing, since it provides a tie plate having a maximum amount ofstrength. with a minimum of metal, the metal being disposed. so as togive the greatest strength to the plate at the point oi greatest load.The plain portion 6 ol the plate adjacent to the base of the shoulder orprojection, also forms an increased bearing area for the rail base atthat portion of the plate which receives the greatest load, therebyproviding for a more uniform wear of the plate.

I claim 1. A railway tie plate having a transverse rail-bearing shoulderor projection on its upper sur'l'ace, near one end, and also having aplurality of longitudinal grooves on its upper surl'ace, each of saidgrooves extending from the extreme opposite end of the plate to andterminating at a point beyond the center of the plate, but at a distancefrom the base of the shoulder or projection, whereby there is providedadjacent to the shoulder or having on its under side the longitudinallyprojection a plain ungrooved portion of the full thickness of the plate,substantially as described.

2. A railway tie plate having a transverse rail-bearing shoulder orprojection on its upper surface near one end, and also havinglongitudinally extending grooves or depressions in its upper surfacewhich terminate at a distance from the base of said shoulder orprojection to provide a portion adjacent to such base of the fullthickness of the plate, said grooves being again continued at theopposite side of the shoulder or projection; substantially as described.

3. A railway tie plate having a transverse rail-bearing shoulder orprojection on its upper surface near one end, and also having aplurality of grooves or depressions in its upper surface which terminateat a distance from the base of said shoulder or projection to provide aportion adjacent to such base of the full thickness of the plate, saidgrooves being again continued at the opposite side of the shoulder orprojection, substantially as described.

In testimony whereof, I have hereunto set my hand.

LAWRENCE DILWORTH.

Witnesses M. V. KIEHL, H. M. CoRWrN.

